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General Photography
Macro
DoF v Diffraction with the Nikkor 40mm Micro 2.8G
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<blockquote data-quote="Eyelight" data-source="post: 424077" data-attributes="member: 24753"><p>What I was after is seeing where the gain in DoF is overwhelmed by diffraction. We hear and see a lot about it, but the real world exist in my head, so here we are.</p><p></p><p>The first series shown in post #1 was shot with the focus set to the minimum which extends the the lens and increases the focal length. The increase in focal length is what allows the smaller f/stops beyond f/22.</p><p></p><p>DoF increase with each progressively smaller f/stop in each image, so the greatest DoF is in #6. Diffraction is also increasing with each progressively smaller f/stop in each image.</p><p></p><p>The sharpest fibers in #1 appear progressively sharper in #2 and #3, level off in #4 and softens slightly in #5. There is a trade-off between #4 and #5. #4 is slightly sharper at the focal plane than #5, but #5 has slightly larger DoF and there are fibers in #5 that are sharper than in #4 due to this.</p><p></p><p>Step back to the reality of a normal print size and there is not much to distinguish 4 & 5 due to the aforementioned trade-off and #6 doesn't look bad at all.</p><p></p><p></p><p>#6</p><p>[ATTACH=full]143634[/ATTACH]</p><p></p><p>The second series shown in post #3 was shot at less magnification and it shows that diffraction occurs at a larger aperture than it does when the lens is focused at 1:1.</p></blockquote><p></p>
[QUOTE="Eyelight, post: 424077, member: 24753"] What I was after is seeing where the gain in DoF is overwhelmed by diffraction. We hear and see a lot about it, but the real world exist in my head, so here we are. The first series shown in post #1 was shot with the focus set to the minimum which extends the the lens and increases the focal length. The increase in focal length is what allows the smaller f/stops beyond f/22. DoF increase with each progressively smaller f/stop in each image, so the greatest DoF is in #6. Diffraction is also increasing with each progressively smaller f/stop in each image. The sharpest fibers in #1 appear progressively sharper in #2 and #3, level off in #4 and softens slightly in #5. There is a trade-off between #4 and #5. #4 is slightly sharper at the focal plane than #5, but #5 has slightly larger DoF and there are fibers in #5 that are sharper than in #4 due to this. Step back to the reality of a normal print size and there is not much to distinguish 4 & 5 due to the aforementioned trade-off and #6 doesn't look bad at all. #6 [ATTACH type="full"]143634._xfImport[/ATTACH] The second series shown in post #3 was shot at less magnification and it shows that diffraction occurs at a larger aperture than it does when the lens is focused at 1:1. [/QUOTE]
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General Photography
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DoF v Diffraction with the Nikkor 40mm Micro 2.8G
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